1 /* 2 * include/linux/memory.h - generic memory definition 3 * 4 * This is mainly for topological representation. We define the 5 * basic "struct memory_block" here, which can be embedded in per-arch 6 * definitions or NUMA information. 7 * 8 * Basic handling of the devices is done in drivers/base/memory.c 9 * and system devices are handled in drivers/base/sys.c. 10 * 11 * Memory block are exported via sysfs in the class/memory/devices/ 12 * directory. 13 * 14 */ 15 #ifndef _LINUX_MEMORY_H_ 16 #define _LINUX_MEMORY_H_ 17 18 #include <linux/sysdev.h> 19 #include <linux/node.h> 20 #include <linux/compiler.h> 21 #include <linux/mutex.h> 22 23 struct memory_block { 24 unsigned long phys_index; 25 unsigned long state; 26 /* 27 * This serializes all state change requests. It isn't 28 * held during creation because the control files are 29 * created long after the critical areas during 30 * initialization. 31 */ 32 struct mutex state_mutex; 33 int phys_device; /* to which fru does this belong? */ 34 void *hw; /* optional pointer to fw/hw data */ 35 int (*phys_callback)(struct memory_block *); 36 struct sys_device sysdev; 37 }; 38 39 /* These states are exposed to userspace as text strings in sysfs */ 40 #define MEM_ONLINE (1<<0) /* exposed to userspace */ 41 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ 42 #define MEM_OFFLINE (1<<2) /* exposed to userspace */ 43 #define MEM_GOING_ONLINE (1<<3) 44 #define MEM_CANCEL_ONLINE (1<<4) 45 #define MEM_CANCEL_OFFLINE (1<<5) 46 47 struct memory_notify { 48 unsigned long start_pfn; 49 unsigned long nr_pages; 50 int status_change_nid; 51 }; 52 53 struct notifier_block; 54 struct mem_section; 55 56 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE 57 static inline int memory_dev_init(void) 58 { 59 return 0; 60 } 61 static inline int register_memory_notifier(struct notifier_block *nb) 62 { 63 return 0; 64 } 65 static inline void unregister_memory_notifier(struct notifier_block *nb) 66 { 67 } 68 static inline int memory_notify(unsigned long val, void *v) 69 { 70 return 0; 71 } 72 #else 73 extern int register_memory_notifier(struct notifier_block *nb); 74 extern void unregister_memory_notifier(struct notifier_block *nb); 75 extern int register_new_memory(struct mem_section *); 76 extern int unregister_memory_section(struct mem_section *); 77 extern int memory_dev_init(void); 78 extern int remove_memory_block(unsigned long, struct mem_section *, int); 79 extern int memory_notify(unsigned long val, void *v); 80 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) 81 82 83 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ 84 85 #ifdef CONFIG_MEMORY_HOTPLUG 86 #define hotplug_memory_notifier(fn, pri) { \ 87 static struct notifier_block fn##_mem_nb = \ 88 { .notifier_call = fn, .priority = pri }; \ 89 register_memory_notifier(&fn##_mem_nb); \ 90 } 91 #else 92 #define hotplug_memory_notifier(fn, pri) do { } while (0) 93 #endif 94 95 #endif /* _LINUX_MEMORY_H_ */ 96